Symptoms of breast cancer metastasis first involve the lymph nodes, with multiple enlarged lymph nodes that can be felt beneath and above the collarbone. These can be diagnosed as metastases from breast cancer using color Doppler ultrasound and cytopathology puncture. The second symptom is bone metastasis. If there is pain in the pelvic or rib area, and an increase in alkaline phosphatase in the blood biochemistry, high suspicion of bone metastasis should be considered. It is necessary to conduct a PADCT or bone scan for further confirmation. If symptoms like coughing, expectorating phlegm, and blood-tinged sputum appear, lung metastasis should be considered, requiring further diagnosis with a CT scan.